16633 Foltz Parkway ●Strongsville, OH 44149 USA Telephone: +1 (440) 572-1500 ●Fax: +1 (440) 238-8828
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d. Examine the drain path to make sure water has a clear drain path.
e. Inspect magnets on the action of the switch to make sure no debris have stopped the action.
3. Test the unit for proper functioning
a. To test the switch assembly, set the unit in a vise and make sure that the switch housing is
vertical as if it were mounted on the boiler piping.
b. Attach an ohm meter to the common and normally open switch contact and manually move the
float up and down and verify the switch operates on both directions. The meter should indicate
continuity only when the switch is operated in the closed position.
c. Then, move the ohm meter terminal from the normally open terminal to the normally closed
terminal and repeat the test. The meter should indicate an open circuit only when the switch is in
the open position.
4. If the unit fails to test properly, contact Clark-Reliance®for further instructions to adjust the switch
mechanism or to obtain authorization to return the unit for factory inspection. If the switch tests OK,
return unit to service.
5. Reassemble the unit. Reinstall the Switch head assembly onto the body with a new gasket. Lubricate the
bolts with a Nickel based high temperature lubricant and torque to requirements in the Installation section.
6. Verify proper function.
Symptom Probable Cause
2) Float is stuck in the “down” position” a) Float encased in contamination
b) Failed float
c) Contaminants in Pressure Tube.
Possible remedies:
1. Inspect the internal portion of the Levalarm®Chamber
a. Isolate the Levalarm®and make sure there is no pressure in the unit.
b. Remove the flange head assembly
c. Remove, inspect the float assembly.
d. If the float contains water or shows signs of obvious damage, such as collapse or a crack near the
spud where the float rod attaches, replace the float and use Loctite or equal on the threads of the
float and float rod with a lock washer. Tighten the new float securely onto the float rod.
2. Test the unit for proper functioning
a. To test the switch assembly, set the unit in a vise and make sure that the switch housing is
vertical as if it were mounted on the boiler piping.
b. Attach an ohm meter to the common and normally open switch contact and manually move the
float up and down and verify the switch operates on both directions. The meter should indicate
continuity only when the switch is operated in the closed position.
c. Then, move the ohm meter terminal from the normally open terminal to the normally closed
terminal and repeat the test. The meter should indicate an open circuit only when the switch is in
the open position.
3. If the unit fails to test properly, contact Clark-Reliance®for further instructions to adjust the switch
mechanism or to obtain authorization to return the unit for factory inspection.
4. Reassemble the unit. Reinstall the Switch head assembly onto the body with a new gasket and apply a
Teflon based sealant to both sides of the gasket. Lubricate the bolts with a Nickel based high temperature
lubricant and torque to requirements in the Installation section.
